CN113755722A - High-strength and high-toughness heat-treatment-free aluminum alloy material and preparation method thereof - Google Patents
High-strength and high-toughness heat-treatment-free aluminum alloy material and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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Abstract
The invention discloses a high-strength and high-toughness heat-treatment-free aluminum alloy material and a preparation method thereof, belonging to the technical field of aluminum alloy casting, and comprising the following components in percentage by mass: 8.0 to 10.5 percent of Si, less than or equal to 0.15 percent of Fe, 0.05 to 0.3 percent of Mg0.05 to 0.3 percent of Zn0.05 to 0.3 percent of Mn0.3 to 0.6 percent of Cu, less than or equal to 0.1 percent of Cu, 0.05 to 0.15 percent of Ti0.05 percent of Ca, less than or equal to 0.005 percent of Sr0.005 to 0.030 percent of Zr0.1 to 0.3 percent of Mo0.01 to 0.1 percent of V, 0.01 to 0.3 percent of Cr, less than or equal to 0.02 percent of Na, less than or equal to 0.002 percent of P, less than or equal to 0.01 percent of Cd, less than or equal to 0.001 percent of Li, less than or equal to 0.0025 percent of B, less than or equal to 0.05 percent of Ga, and the balance of Al and inevitable impurities; the alloy does not need heat treatment, and has excellent casting performance, mold filling capacity, tensile strength, yield strength and toughness.
Description
Technical Field
The invention relates to the technical field of aluminum alloy casting, in particular to a high-strength and high-toughness heat-treatment-free aluminum alloy material and a preparation method thereof.
Background
With the demands of environmental protection and energy conservation, the design of lightweight automobiles has become the trend of automobile development in the world. The development of light weight of automobiles cannot be separated from the development of related fields such as materials, molding technology, equipment, structural design and the like. The die casting process of the structural part and the manufacturing technology of the material for the structural part are the key points for the lightweight development of the automobile.
The automobile structural part is a component which plays a main supporting and bearing role on an automobile body and is used as an installation foundation of automobile body parts; generally has the characteristics of large size, thin wall, complex structure, weldability and the like; because of the close relation with the safety of automobiles, good toughness is required while ensuring higher tensile strength and yield strength.
The traditional structural member is generally formed by stamping and splicing steel plates, and is required to be riveted/welded for tens of times to hundreds of times. The aluminum alloy is adopted for casting and forming, so that one-time simple die-casting processing can be realized, the welding process is improved from a few hours to a few minutes, the connecting process is simplified, the cost is reduced, and the efficiency is improved; with the further expansion of the field of integration, the integrated structural member has the characteristics of larger size and more complex shape, and is not suitable for heat treatment strengthening, and the mechanical property of the traditional aluminum alloy material can not meet the standard requirement without heat treatment. And the heat treatment requires a large amount of energy, effort and time, increasing the production cost.
Disclosure of Invention
The invention aims to provide a high-strength and high-toughness heat-treatment-free aluminum alloy material and a preparation method thereof, so as to solve the problems in the prior art, the aluminum alloy material can be cast and formed at one time, a rivet welding process and a heat treatment process are omitted, the aluminum alloy material has excellent casting performance and mold filling capacity, and good tensile strength, yield strength and toughness, and an automobile structural member manufactured by the aluminum alloy material has the advantages of structure integration, easiness in processing and forming and good performance stability.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a high-strength and high-toughness heat-treatment-free aluminum alloy material which comprises the following components in percentage by mass:
8.0 to 10.5 percent of Si, less than or equal to 0.15 percent of Fe, 0.05 to 0.3 percent of Mg0.05 to 0.3 percent of Zn0.05 to 0.3 percent of Mn0.3 to 0.6 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.005 percent of Ca, 0.005 to 0.030 percent of Sr0.005, 0.1 to 0.3 percent of Zr0.01, 0.01 to 0.1 percent of Mo0.1 percent of V, 0.01 to 0.3 percent of Cr, less than or equal to 0.02 percent of Na, less than or equal to 0.002 percent of P, less than or equal to 0.01 percent of Cd, less than or equal to 0.001 percent of Li, less than or equal to 0.0025 percent of B, less than or equal to 0.05 percent of Ga, and the balance of Al and inevitable impurities.
Furthermore, the content of single element in the inevitable impurities is less than or equal to 0.02 wt%, and the total content is less than or equal to 0.15 wt%.
The invention also provides a preparation method of the high-strength and high-toughness heat-treatment-free aluminum alloy material, which comprises the following steps:
(1) preparing raw materials according to a proportion for later use;
(2) heating the smelting furnace to 750-760 ℃ for heat preservation, adding various raw materials and heating to be molten to obtain a first alloy liquid;
(3) deslagging the first alloy liquid, degassing and standing to obtain a second alloy liquid;
(4) and degassing, filtering and casting the second alloy liquid on line to obtain the high-strength and high-toughness heat-treatment-free aluminum alloy material.
Further, in the step (3), the temperature of the melting furnace is adjusted to 710-.
Further, the refining agent is selected from aluminum zirconium master alloy.
Further, in the step (3), the degassing is in-furnace degassing; and adjusting the temperature of the furnace to 690-710 ℃ during degassing in the furnace, and degassing in the furnace under the nitrogen condition.
Further, the pressure of a nitrogen outlet for degassing in the furnace is 0.4-0.6Mpa, and the degassing time is not less than 50 min.
Further, the rotation speed of the online degassing degasser is 460-500rpm, and the nitrogen flow is 15-25 LPM; before online degassing, the degassing box is subjected to preheating treatment at the temperature of 350-450 ℃.
Further, in the step (4), the casting is casting, the casting temperature is 650-680 ℃, and the casting speed is 30-50 Hz.
The invention discloses the following technical effects:
aiming at the characteristics of large size, complex structure, high strength and toughness requirement and difficult heat treatment of an automobile structural part, the invention provides a high strength and toughness heat-treatment-free aluminum alloy material, which has the following advantages:
1. the design aspect of the components is as follows: according to the characteristics of the material and the casting and processing requirements, the ranges of all elements are reasonably controlled.
Si is a main alloying element in the Al-Si alloy, is controlled to be 8.0-10.5 percent and is positioned at the upper limit of hypoeutectic series, the alloy in the range has good casting and filling performance and good contractibility, and meanwhile, primary crystal silicon does not appear, and the alloy is suitable for large-scale assemblies and filling complex structures.
Sr is controlled to be 0.005-0.03%, the shape of eutectic silicon can be effectively improved, the eutectic silicon is changed into a short rod shape from a needle shape and a sheet shape, the aluminum matrix is prevented from being cut, and the strength and the toughness of the alloy are effectively improved.
Mn is controlled to be 0.3-0.6%, and Al is formed in the alloy12Mn3Si2The compound phase is in a spherical particle or Chinese character-shaped structure with AlFeMnSi, so that the formation of a long needle-shaped Fe phase is avoided, and the demoulding property of the alloy is improved; can also be in the form of MgUniform deposition, improved corrosion resistance and improved welding performance.
Zr, Mo, V and Ti are controlled in 0.1-0.3%, 0.01-0.1%, 0.01-0.3% and 0.05-0.15% separately and used as the heterogeneous nucleation point of alpha aluminum phase to refine the crystal grain of alpha aluminum phase structure of alloy, raise the re-crystallization temperature of alloy and raise the tensile strength, yield strength and toughness of alloy.
Mg and Zn are controlled to be 0.05-0.3%, Cu is controlled to be less than or equal to 0.1%, and a strengthening phase Mg can be formed2Si、Al2Cu、MgZn2The method has the advantages that the obvious strengthening effect is generated on the alloy, the tensile strength and the yield strength of the alloy are obviously improved, the toughness of the alloy is not affected, and meanwhile, the long-term stability of the alloy strength is ensured by utilizing the natural aging characteristic of Zn.
Strictly controlling the range of impurity elements such as Ca, Na, P and the like, formulating a reasonable control range and ensuring that the casting mold has good mechanical property, casting property and mold filling capacity.
2. The material selection aspect is as follows: according to the component design structure, electrolytic aluminum with high purity, industrial silicon and other additive materials are selected, and the impurity elements such as Fe, Ca, Na and P are introduced as little as possible, so that the aluminum alloy material has good casting capacity and mold filling capacity, good ductility, good tensile strength and good yield strength.
3. And (3) purification treatment aspect: the method ensures that the aluminum liquid has higher purity by efficiently removing non-metallic inclusions, oxides and gas in the aluminum liquid, and avoids the generation of later-period defective products due to poor purification treatment effect of the gas content in the aluminum liquid.
4. The casting process comprises the following steps: the invention provides proper casting temperature and casting parameters, and ensures that the alloy has uniform and compact grain structure.
The high-strength and high-toughness heat-treatment-free aluminum alloy material is mainly applied to the production of structural parts which are large in size, complex in structure, high in strength and toughness and difficult to heat treat, can meet the production requirements of automobile structural parts with tensile strength of more than or equal to 250MPa, yield strength of more than or equal to 130MPa and elongation of more than or equal to 10% under the condition of no heat treatment, and can break through the bottleneck of industrial popularization technology, so that the domestic production of the aluminum alloy material for the high-performance structural parts is promoted, and the high-strength and high-toughness heat-treatment-free aluminum alloy material has great significance for promoting the lightweight development of automobiles.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The materials of the embodiment of the invention are selected as follows:
| serial number | Name of Material | Specification, model and lot number | Suppliers of goods |
| 1 | A00 | Al99.7 | DT |
| 2 | Industrial silicon | 441 | FD |
| 3 | Aluminium titanium intermediate alloy | AlTi10 | ST |
| 4 | Aluminium zirconium intermediate alloy | AlZr10 | ST |
| 5 | Aluminum strontium rod | AlSr10 | ST |
| 6 | Electrolytic manganese | DJMn99.7 | HN |
| 7 | Metallic magnesium | Second stage | YH |
| 8 | Metallic zinc | 1# | ST |
| 9 | Aluminum molybdenum intermediate alloy | AlMo5 | ST |
| 10 | Aluminium vanadium intermediate alloy | AlV10 | ST |
Example 1
The embodiment provides a high-strength and high-toughness heat-treatment-free aluminum alloy material which comprises the following components in percentage by mass:
9.5 percent of Si, 0.10 percent of Fe, 0.2 percent of Mg0.15 percent of Zn0.5 percent of Mn0.5 percent of Cu0.08 percent of Ti, 0.09 percent of Ca0.004 percent of Sr0.015 percent of Zr, 0.2 percent of Mo0.05 percent of V, 0.15 percent of Cr0.015 percent of Na, 0.002 percent of P, 0.01 percent of Cd0.001 percent of Li0.001 percent of B, 0.0025 percent of Ga0.05 percent of Ca and the balance of Al and inevitable impurities, wherein the content of single element in the inevitable impurities is 0.018 percent by weight at most, and the total content is 0.13 percent by weight.
The preparation method comprises the following steps:
(1) preparing raw materials according to the proportion of alloy elements for later use;
(2) heating the smelting furnace to 755 ℃ for heat preservation, firstly adding an A00 aluminum ingot, after the aluminum ingot is completely melted, adding the rest raw materials, and stirring for 15min to fully mix and dissolve each alloy element in the melt to obtain a first alloy liquid;
(3) refining and deslagging: adjusting the temperature of the smelting furnace to 720 ℃, adding 3 wt% of aluminum zirconium intermediate alloy into the melt, wherein the adding mode is that nitrogen is used as a carrier to be blown into the aluminum liquid to cover the whole molten pool, fully stirring for 15min, standing for 5min, removing floating slag, and removing impurities in the aluminum liquid to the maximum extent;
(4) degassing in a furnace: adjusting the temperature of the smelting furnace to 700 ℃, blowing nitrogen into the aluminum liquid by using a four-tube degassing harrow, wherein the pressure of a nitrogen outlet is 0.5Mpa, and the degassing time is 60 min; standing for 15 min;
(5) online degassing: when casting, the molten aluminum flows into a degassing box from a smelting furnace, online degassing is carried out in the degassing box according to a dual-rotor GBF degassing machine in the whole process, the rotating speed of the degassing machine is set to be 480rpm, the nitrogen flow is 20LPM, and the whole casting process is covered;
(6) casting: filtering the molten aluminum by a 20ppi foamed ceramic filter plate, removing impurities remained in the melt or generated by casting fall, and casting; preheating a degassing tank to 400 ℃ before casting, baking a pouring kettle for 25min, preheating a die to 130 ℃, casting at 670 ℃ and casting at the casting speed of 4Hz to obtain the high-strength and high-toughness heat-treatment-free aluminum alloy material.
Example 2
The embodiment provides a high-strength and high-toughness heat-treatment-free aluminum alloy material which comprises the following components in percentage by mass:
10.5% of Si, 0.08% of Fe0, 0.05% of Mg0, 0.3% of Zn0, 0.3% of Mn0, 0.1% of Cu0, 0.15% of Ti0.005% of Ca0.005%, 0.005% of Sr0.005%, 0.3% of Zr0.1%, 0.28% of V, 0.02% of Cr0.02%, 0.002% of Na0.0015% of P, 0.009% of Cd0.009%, Li0.001%, 0.0025% of B, 0.03% of Ga0.03% of the balance Al and inevitable impurities, wherein the inevitable impurities contain a maximum of 0.02 wt% of single elements and a total content of 0.14 wt%.
The preparation method comprises the following steps:
(1) preparing raw materials according to the proportion of alloy elements for later use;
(2) heating the smelting furnace to 750 ℃ for heat preservation, firstly adding an A00 aluminum ingot, after the aluminum ingot is completely melted, adding the rest raw materials, and stirring for 15min to fully mix and dissolve each alloy element in the melt to obtain a first alloy liquid;
(3) refining and deslagging: adjusting the temperature of the smelting furnace to 730 ℃, adding 3 wt% of aluminum zirconium intermediate alloy into the melt, wherein the adding mode is that nitrogen is used as a carrier to be blown into the aluminum liquid to cover the whole molten pool, fully stirring for 15min, standing for 5min, removing floating slag, and removing impurities in the aluminum liquid to the maximum extent;
(4) degassing in a furnace: adjusting the temperature of the smelting furnace to 690 ℃, blowing nitrogen into the aluminum liquid by using a four-tube degassing harrow, wherein the outlet pressure of the nitrogen is 0.6Mpa, and the degassing time is 50 min; standing for 20 min;
(5) online degassing: during casting, aluminum liquid flows into a degassing box from a smelting furnace, online degassing is carried out in the degassing box according to a dual-rotor GBF degassing machine in the whole process, the rotating speed of the degassing machine is set to be 460rpm, the nitrogen flow is 25LPM, and the whole casting process is covered;
(6) casting: filtering the molten aluminum by a 20ppi foamed ceramic filter plate, removing impurities remained in the melt or generated by casting fall, and casting; preheating a degassing tank to 350 ℃ before casting, baking a pouring kettle for 30min, preheating a die to 80 ℃, casting at 680 ℃ and at a casting speed of 30Hz to obtain the high-strength and high-toughness heat-treatment-free aluminum alloy material.
Example 3
The embodiment provides a high-strength and high-toughness heat-treatment-free aluminum alloy material which comprises the following components in percentage by mass:
8.0 percent of Si, 0.15 percent of Fe0, 0.3 percent of Mg0, 0.05 percent of Zn0, 0.6 percent of Mn0, 0.08 percent of Cu0, 0.05 percent of Ti0.004 percent of Ca0.004 percent of Sr0.030 percent of Zr0.1 percent of Mo0.09 percent of V, 0.3 percent of Cr0.02 percent of Na0.001 percent of P, 0.002 percent of Cd0.01 percent of Li0.0008 percent of B, 0.0020 percent of Ga0.02 percent of the balance of Al and inevitable impurities, wherein the content of single elements in the inevitable impurities is maximally 0.015 percent by weight, and the total content is 0.15 percent by weight.
The preparation method comprises the following steps:
(1) preparing raw materials according to the proportion of alloy elements for later use;
(2) heating the smelting furnace to 760 ℃ for heat preservation, firstly adding an A00 aluminum ingot, after the aluminum ingot is completely melted, adding the rest raw materials, and stirring for 15min to fully mix and dissolve all alloy elements in the melt to obtain a first alloy liquid;
(3) refining and deslagging: adjusting the temperature of the smelting furnace to 710 ℃, adding 3 wt% of aluminum zirconium intermediate alloy into the melt, wherein the adding mode is that nitrogen is used as a carrier to be blown into the aluminum liquid to cover the whole molten pool, fully stirring for 15min, standing for 5min, removing floating slag, and removing impurities in the aluminum liquid to the maximum extent;
(4) degassing in a furnace: adjusting the temperature of the smelting furnace to 710 ℃, blowing nitrogen into the aluminum liquid by using a four-tube degassing harrow, wherein the pressure of a nitrogen outlet is 0.4Mpa, and the degassing time is 70 min; standing for 10 min;
(5) online degassing: when casting, aluminum liquid flows into a degassing box from a smelting furnace, online degassing is carried out in the degassing box according to a dual-rotor GBF degassing machine in the whole process, the rotating speed of the degassing machine is set to be 500rpm, the nitrogen flow is 15LPM, and the whole casting process is covered;
(6) casting: filtering the molten aluminum by a 20ppi foamed ceramic filter plate, removing impurities remained in the melt or generated by casting fall, and casting; preheating a degassing tank to 450 ℃ before casting, baking a pouring kettle for 20min, preheating a die to 150 ℃, casting at 650 ℃, and casting at a rate of 50Hz to obtain the high-strength and high-toughness heat-treatment-free aluminum alloy material.
Comparative example 1
The only difference from example 1 is that the Si content in the alloying element is 11%.
Comparative example 2
The difference from example 1 is only that the Sr content in the alloy material element is 0.005%.
Comparative example 3
The difference from example 1 is only that the Sr content in the alloy material element is 0.03%.
Comparative example 4
The difference from example 1 is only that the Sr content in the alloy material element is 0.004%.
Comparative example 5
The difference from example 1 is only that the Sr content in the alloy material element is 0.035%.
Comparative example 6
The only difference from example 1 is that the Ga content in the alloying element is 0.01%.
Comparative example 7
The only difference from example 1 is that the Ga content in the alloying element is 0.06%.
Comparative example 8
The only difference from example 1 is that the Ga content in the alloying element is 0.08%.
Comparative example 1
The alloy material in embodiment 1 of the invention patent CN111139381A is adopted.
Comparative example 2
The alloy material in embodiment 3 of the invention patent CN111254325A is adopted.
Comparative example 3
The alloy material in embodiment 8 of the invention patent CN113106300A is adopted.
The aluminum alloy materials of examples 1 to 3, comparative examples 1 to 8 and comparative examples 1 to 3 were formed into thin-walled structural members having a thickness of 2 to 5.5mm by vacuum die casting without heat treatment, and the mechanical properties thereof were measured and the results were averaged as shown in Table 1.
TABLE 1
| Tensile strength/Mpa | Yield strength/Mpa | Elongation/percent | |
| Example 1 | 268 | 148 | 21 |
| Example 2 | 259 | 142 | 13 |
| Example 3 | 255 | 134 | 14 |
| Comparative example 1 | 214 | 105 | 11 |
| Comparative example 2 | 252 | 133 | 12 |
| Comparative example 3 | 256 | 137 | 15 |
| Comparative example 4 | 242 | 131 | 9 |
| Comparative example 5 | 246 | 121 | 11 |
| Comparative example 6 | 266 | 149 | 20 |
| Comparative example 7 | 242 | 132 | 13 |
| Comparative example 8 | 231 | 125 | 8 |
| Comparative example 1 | 192 | 97 | 9 |
| Comparative example 2 | 232 | 143 | 8 |
| Comparative example 3 | 175 | 92 | 10 |
The aluminum alloy material body (DF) of example 1 was sampled to prepare a single test bar, and the tensile strength, yield strength, and elongation of the test bar were measured to be 310Mpa, 150Mpa, and 13.5%, respectively.
According to the results, the mechanical properties of the automobile structural part can meet the performance requirements of tensile strength of more than or equal to 250MPa, yield strength of more than or equal to 130MPa and elongation of more than or equal to 10% through the product components and process design without heat treatment, and the use requirements of customers are met.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. The high-strength and high-toughness heat-treatment-free aluminum alloy material is characterized by comprising the following components in percentage by mass:
8.0 to 10.5 percent of Si, less than or equal to 0.15 percent of Fe, 0.05 to 0.3 percent of Mg0.05 to 0.3 percent of Zn0.05 to 0.3 percent of Mn0.3 to 0.6 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.005 percent of Ca, 0.005 to 0.030 percent of Sr0.005, 0.1 to 0.3 percent of Zr0.01, 0.01 to 0.1 percent of Mo0.1 percent of V, 0.01 to 0.3 percent of Cr, less than or equal to 0.02 percent of Na, less than or equal to 0.002 percent of P, less than or equal to 0.01 percent of Cd, less than or equal to 0.001 percent of Li, less than or equal to 0.0025 percent of B, less than or equal to 0.05 percent of Ga, and the balance of Al and inevitable impurities.
2. The high-toughness heat-treatment-free aluminum alloy material according to claim 1, wherein the content of a single element in the inevitable impurities is less than or equal to 0.02 wt%, and the total content of the single element in the inevitable impurities is less than or equal to 0.15 wt%.
3. The preparation method of the high-strength and high-toughness heat-treatment-free aluminum alloy material as set forth in any one of claims 1-2, characterized by comprising the following steps:
(1) preparing raw materials according to a proportion for later use;
(2) heating the smelting furnace to 750-760 ℃ for heat preservation, adding various raw materials and heating to be molten to obtain a first alloy liquid;
(3) deslagging the first alloy liquid, degassing and standing to obtain a second alloy liquid;
(4) and degassing, filtering and casting the second alloy liquid on line to obtain the high-strength and high-toughness heat-treatment-free aluminum alloy material.
4. The preparation method as claimed in claim 3, wherein in step (3), the temperature of the furnace is adjusted to 710 ℃ and 730 ℃ during deslagging, and 3 wt% of refining agent is added for purification treatment.
5. The method of claim 4, wherein the refining agent is selected from the group consisting of aluminum zirconium master alloys.
6. The production method according to claim 3, wherein in step (3), the degassing is in-furnace degassing; and adjusting the temperature of the furnace to 690-710 ℃ during degassing in the furnace, and degassing in the furnace under the nitrogen condition.
7. The method according to claim 6, wherein the nitrogen outlet pressure for the in-furnace degassing is 0.4 to 0.6MPa, and the degassing time is not less than 50 min.
8. The preparation method as claimed in claim 3, wherein the rotation speed of the degasser for online degassing is 460-500rpm, and the nitrogen flow rate is 15-25 LPM; before online degassing, the degassing box is subjected to preheating treatment at the temperature of 350-450 ℃.
9. The production method according to claim 3, wherein in the step (4), the casting is casting at 650-680 ℃ and at a casting rate of 30-50 Hz.
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| CN114293058A (en) * | 2021-12-20 | 2022-04-08 | 天津新立中合金集团有限公司 | Preparation method of high-strength and high-toughness heat-treatment-free material suitable for castings with various wall thicknesses |
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